Multi-stage rainwater biological treatment device

Abstract

The invention discloses a multi-stage rainwater biological treatment device which comprises a presedimentation pool and a filter pool. A water inlet is formed in the presedimentation pool, a drainage opening is formed in the filter pool, and an overflow baffle structure is arranged between the presedimentation pool and the filter pool. A porous medium filter layer is arranged at the bottom of the filter pool, a biomedium layer is arranged at the top of the porous filter medium layer, a rainwater collecting pipe is buried in the porous filter medium layer, a plurality of rainwater inlets are formed in the pipe wall of the rainwater collecting pipe, one end of the rainwater collecting pipe is connected with a cleaning pipe, the other end of the rainwater collecting pipe is connected with a drainage pipe, and the drainage pipe is connected with the drainage opening. A cover plate is arranged at the top of a multi-stage treatment pool, and provided with a biomedium layer plant seed inlet. The multi-stage rainwater biological treatment device integrates gravity settling, screening, filtering and biological treatment functions to carry out multi-stage treatment on rainwater, after sediment of the rainwater is removed through the presedimentation pool, preliminary purification is carried out on the rainwater through the overflow baffle structure, further filtering and biological treatment are carried out on the rainwater through the biomedium layer, plants and the porous medium filter layer, and therefore pollutants are effectively removed.

Description

technical field [0001] The invention relates to rainwater treatment equipment, in particular to a multi-stage rainwater biological treatment device. Background technique [0002] With the acceleration of the urbanization process, the impermeable area on the ground has increased significantly, and pollutants have gradually accumulated on these impermeable ground. Pollution is a kind of diffuse pollution, and then enters the natural water body, causing water pollution. The pollutants include particulate matter, organic matter, heavy metals and other toxic and harmful substances. Therefore, the process of urbanization and industrialization has led to increasingly serious water crisis and rain and flood hazards. [0003] With the aggravation of water source crisis and rain and flood damage, it has become an important emerging topic to collect and utilize rainwater as water resources for comprehensive management. In terms of urban overall planning, most of the combined drainage...

AI Technical Summary

Problems solved by technology

[0004] At present, the collection and treatment of initial rainwater in my country is still in its infancy. The collection of initial rainwater is only to prevent it from being discharged into the water body to pollute the water quality. The purification treatment and reuse of initial rainwater are rarely considered, and most of them are directly discharged into municipal domestic sewage pipes. network

The concentration of pollutants contained in the initial rainwater is relatively high, especially the initial rainwater on the road. Direct discharge into the domestic sewage pipe network will bring a greater load to the sewage plant

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